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Re: How Much Boost????
The 1255 lb of torque pull was with a 5" pulley on the blower, the 1188 pull, I used a 5.5".both used the 7.65 crank pulley. I wanted to do one pull with race gas and more timing, run it up to 7000 rpm but I ran out of time.
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Re: How Much Boost????
Interesting, seems that at about 5000rpm the belt starts slipping. Which has more area under the curve? Because of the slippage problem, I would use a bigger pully and less boost and extend your rpm range. I would bet that you would be able to go faster with a bigger pully and no slippage.
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Re: How Much Boost????
Originally Posted by cobra marty
Interesting, seems that at about 5000rpm the belt starts slipping. Which has more area under the curve? Because of the slippage problem, I would use a bigger pully and less boost and extend your rpm range. I would bet that you would be able to go faster with a bigger pully and no slippage.
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Bringing this thread back up. :nicethread:
468CI Dart alum heads 9:1 static 420 B&M 6psi no chiller. |
Originally Posted by MILD THUNDER
(Post 4241480)
Bringing this thread back up. :nicethread:
468CI Dart alum heads 9:1 static 420 B&M 6psi no chiller. |
588 cu in...8.6 static...dart 355 cnc heads...superchiller cooler under 8.3L whipple 13 lbs boost...1200 hp at 6500 and still rising.cam xxx.hyd roller.
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Bare 502ci block and an 871/twin 850's . Workin on the rest . :cool-smiley-011:
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Bringing it back..
496 8.25 to 1 Un ported oval port iron heads. 671 8% overdriven 7psi 29 degrees timing 91 oct Two 800 edelbrocks Non intercooled 706hp at 5900 |
500HP +.030 procharger 6psi @ 5200
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Originally Posted by Awdgsx
(Post 4306426)
Bringing it back..
496 8.25 to 1 Un ported oval port iron heads. 671 8% overdriven 7psi 29 degrees timing 91 oct Two 800 edelbrocks Non intercooled 706hp at 5900 |
Great thread
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Damn, this is an old thread!!!
In 2015 I built a completely new set of engines for the boat. They have over 275hr on them and I freshened the top ends last year. 8.3:1 compression AFR 357CNC Custom Hyd. Roller Cam w/ Johnson Racing lifters 8:71, 3% overdriven 6psi boost. 964HP and 924t lbs. https://scontent-lga3-1.xx.fbcdn.net...WA&oe=62397B7D
Originally Posted by Panther
(Post 1293062)
Static compression 8.1:1
Boost pressure 5 psi Displacement 580" Heads Merlin 345 w/ 126 CC chambers. Cam: Lunati Hyd. Blower Cam (.571 - .580) the rest I'm not sure 8-71 Hampton Blower underdriven 5% 766 hp and 753 lbs. torque at 4500. I went with a conservative setup for longevity but I could always pump up the boost if I want more juice. :eek: |
Originally Posted by Panther
(Post 4822352)
Damn, this is an old thread!!!
In 2015 I built a completely new set of engines for the boat. They have over 275hr on them and I freshened the top ends last year. 8.3:1 compression AFR 357CNC Custom Hyd. Roller Cam w/ Johnson Racing lifters 8:71, 3% overdriven 6psi boost. 964HP and 924t lbs. https://scontent-lga3-1.xx.fbcdn.net...WA&oe=62397B7D |
Originally Posted by Unlimited jd
(Post 4822358)
still 580”?
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I dont remember half the stuff in this thread :)
Ironically i just stumbled across this video last week Crazy I had hair and no brains back then! sry i used my phone on the plasma on vhs c i think its the combo above that was in my hustler with arnesons. |
i think the rod flew out the side... thats why it ended so quick
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Bassett Headers? Sweet!
How much boost? :( |
Originally Posted by KNOT-RIGHT
(Post 4824580)
i think the rod flew out the side... thats why it ended so quick
Anybody know the story. It did end rather abruptly. Went back and listened again. Even with my deaf azz ears it sure sounds like something let lose. Sounded like top end though. |
525SC was a 7.5 compression 5.5psi engine running very rich I thought ??
My 600SC ran like a champ for 300hrs, I never saw over 5psi so maybe Mercury knows something . |
Originally Posted by ICDEDPPL
(Post 4824638)
525SC was a 7.5 compression 5.5psi engine running very rich I thought ??
My 600SC ran like a champ for 300hrs, I never saw over 5psi so maybe Mercury knows something . |
glad you were joking!
Originally Posted by KNOT-RIGHT
(Post 4824580)
i think the rod flew out the side... that's why it ended so quick
https://www.offshoreonly.com/forums/...e-dscn0002.jpg https://www.offshoreonly.com/forums/...e-dscn0129.jpg https://www.offshoreonly.com/forums/...e-dscn0187.jpg |
Originally Posted by getrdunn
(Post 4824631)
Anybody know the story. It did end rather abruptly.
Went back and listened again. Even with my deaf azz ears it sure sounds like something let lose. Sounded like top end though. i pulled them outta the hustler and bumped up to big chief heads from carl foltz bolted on psi blowers thru them in the 46. then went to the dark side with Turbines |
548 quad whipples with Holley snipers and intercooler
8.3:1 with 7psi 30 degrees crane cam 139831 pro top line heads 900 hp pump gas |
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